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F. H. DE VEULLE.

CARBURETER FOR INTERNAL COMBUSTION ENGINES.

APPLICATION mp0 MAR. 30. 1920.

1,365,158. Patented Jan. 11, 1921.

4 [III UNITED STATES PATENT FFIQE.

FREDERICK HENRY DE VEULLE, OF BIRMINGHAM, ENGLAND.

Specification of Letters Patent.

Patented Jan. 11, 1921.

Application filed March 30, 1920. Serial No. 369,952.

To all whom it may concern:

Be it known that I, FREDERICK HENRY on VEULLE, a subject of the King of England, residing at Birmingham, England, have invented certain new and useful Improvements in Carbureters for Internal- (Jombustion Engines, of which the following is a specification.

This invention relates to improvements in carbureters for internal combustion engines, and it preferably has reference to that type in which the air inlet and mixture outlet passages are at right angles to the axis of the throttle valve, which may be a sliding or rotating sleeve. The object of the inven tion to provide an improved baffling screen and filter for the air inlet to catch the mixture blown back and to filter the air, which does not project much from the carburetor body.

A CcO1ding' to this invention, the screen and filter are of horse-shoe or parti-circular shape, their axes are at right angles to the air flow and they are placed concentrically with the throttle, or approximately so when the latter is of sleeve form. This screen is made of sheet metal and is without apertures opposite the actual air inlet, so that the air has to make a bend inside the screen as it enters the carburetor, as also has the mixture blown back from the carbureter. If desired the ends of the carburetor air inlet pipe may be rounded off to conform to the curved air flow.

The accompanying drawings show the application of the invention to a carburetor, having a sliding throttle sleeve valve. In these,

Figure l is a perspective view.

Fig. 2 is a horizontal section, and

Fig. 3 a vertical section.

Like letters indicate like parts throughout the drawings.

For the sake of simplicity certain parts, which have no connection with the present invention, are omitted from these views. The fuel is admitted through the passage A into the spraying chamber B, but the jet nozzle and other parts located in the fuel passage are omitted. The mixture is under the control of a sliding throttle valve C and issues by the branch D to the engine, while the air enters at E.

The gauze is indicated at F and the baiiiing screen at G, both being of horse-shoe shape and mounted concentrically around the throttle chamber H.

Preferably the gauze F is attached at its edges to a light framework, and the sheet metal screen is in two parts, an upper and a lower part G G with flanges G the rounded edges of which engage and grip the frame of the gauze. The upper part G in such a case would be held in place by a nut or cap H on the throttle chamber, when. the throttle is of sleeve form.

The edges Gr fit snugly around the mix-- ture branch D.

It will be seen that the screen G, G is formed with apertures G so positioned as to cause the air to take a curvedpath, as showr by the arrows. Thus, when any mixture is blown back from the carburetor, the fuel therein is deposited on the gauze lining of the screen by centrifugal action, and is picked up by the air passing later. If desired, the corners E may be rounded off to suit the curved air flow.

What I claim as my invention and desire to secure by Letters Patent of the United States is 1. In a carburetor the combination of a throttle chamber, a mixture branch attached at right angles thereto, an air inlet in the side of said throttle chamber, a throttle valve movable in said chamber, a combined screen and filter arranged concentrically around the outside of said throttle chamber, and apertures in said screen causing the air to take a curved path within said screen and filter, substantially as set forth.

2. In a carburetor as claimed in claim 1, the combination with the filter of a screen in two parts joined together and provided with flanges which grip the edges of the filter. substantially as set forth.

3. In a carburetor as claimed in claim 1, the employment of a two part screen the edges of which engage the sides of the throttle chamber and also grip the mixture branch, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FREDERICK HENRY cle VEULLE.

Witnesses:

B. G. HoDesoN, J. H. WALKER. 

